Toothbrush



w. s. FIELD. TOOTHBRUSH.

APPLICATION FILED AUG.9, 1921.

M T NL E5 W5 3 m u w A TTOR/VEYS WILLIAM S. FIELD, OF NEW YORK, N. Y.,ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, TO SANITAS TWIN TOOTHBRUSH; CORP., OF NEW YORK, N. Y., A CORPO- RATION OF NEW YORK..

TOOTHBRUSH.

Specification of Letters Patent. Patented June 27, 1922.

Application filed August 9, 1921. Serial No. 490,935.

to a toothbrush so formed as to simultaneously brush both the inside andoutside of a row of teeth.

The nature of the invention and its distinctive features and advantageswill clearly appear as the description proceeds.

Reference is to be had to the accompanying drawings forming a part ofthis specification, it being understood that the drawings are merelyillustrative of practical examples of the invention.

Figure 1 is a perspective View of a toothbrush embodying my invention;

Figure 2 is a cross section on the line 2-2, Figure 1.

In carrying out my invention in practice an elongated handle 10 isprovided which may be of anysuitable shape, the front end 11 of whichhas brush backs 12 having bristles 13. The brush backs 12 are disposedin planes at angles to each other with the outer surfaces of the backsdisposed laterally outward and their inner surfaces opposed and inflaring relation. Bristles 13 project from the inner faces at rightangles to the planes of the backs 12 but the terminals of the bristlesof each back lie in the same plane, the planes of the terminals of theopposed bristles being disposed adjace-nt to the medial longitudinalplane of the brush.

The described arrangement is effective in thoroughly cleaning both sidesof a row of teeth.

The brush backs 12 are detachable from the handle for renewal or otherthorough cleaning of the brushes proper for which purpose the brushbacks are formed with tenons 14 which are threaded and received in theoblique threaded holes 15 formed inv considerably varied withoutdeparture from the spirit of the invention as defined in the ap )endedclaim.

aving thus described my invention, I claim:

A toothbrush including a handle having a pair of threaded socketstherein intersecting the front surface of said handle, brush backshaving threaded tongues detachably fitting said sockets and projectingfrom said front surface, said backs having opposed bristles.

WILLIAM S. FIELD.

